diff options
| -rw-r--r-- | backends/sdl/sdl-common.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/backends/sdl/sdl-common.cpp b/backends/sdl/sdl-common.cpp index 95c4ea7364..92eca7acf8 100644 --- a/backends/sdl/sdl-common.cpp +++ b/backends/sdl/sdl-common.cpp @@ -233,8 +233,9 @@ void OSystem_SDL_Common::move_screen(int dx, int dy, int height) { copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1); } else if (dy < 0) { // move up - copy from top to bottom + dy = -dy; for (y = dy; y < height; y++) - copy_rect((byte *)_screen->pixels + _screenWidth * (y - dy), _screenWidth, 0, y, _screenWidth, 1); + copy_rect((byte *)_screen->pixels + _screenWidth * y, _screenWidth, 0, y - dy, _screenWidth, 1); } // horizontal movement @@ -244,8 +245,9 @@ void OSystem_SDL_Common::move_screen(int dx, int dy, int height) { copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height); } else if (dx < 0) { // move left - copy from left to right + dx = -dx; for (x = dx; x < _screenWidth; x++) - copy_rect((byte *)_screen->pixels + x - dx, _screenWidth, x, 0, 1, height); + copy_rect((byte *)_screen->pixels + x, _screenWidth, x - dx, 0, 1, height); } } |